This is a series of eleven cards on the subject of Le Maschere (1901) entitled Mascagni in Maschera (Mascagni masked). The cards feature ten commedia dell'arte characters, all of them present in Mascagni's opera except "Stenterello" and "Meneghino".
One character of the opera, "Brighella", is missing from the series. Each character is a caricature of Mascagni drawn by NASICA.
This particular set has handwritten notes dated 1903.